<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-model</title>
</head>
<body>
    <div id="app">
        <input type="text" v-model="message" @keyup.enter="getM">
        <h1>{{message}}</h1>
    </div>
</body>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
    var app = new Vue({
        el:'#app',
        data:{
            message:'好无聊'
        },
        methods:{
            getM(){
                alert(this.message)
            }
        }
    })
</script>
</html>